Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3677435f39d821482c6e682827f6ee9053b778b720e9725e73fbb72dffdab584' 
  AND token = 'PlcjcZIt7sruL3Jbui+nbSeO6ga89P1MYZXvSmiOWM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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