Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e93dcdc42cffd5646966ae403c4c194b371443cf3820467623d5b86ed98a4c9' 
  AND token = 'RCaHhTjnNo2gY18xiHVYR3dpo89Y1HduliOurMtJmNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}