Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa3ddb5e418d1d43c5edf7e00b9eb7cd9d89dedae346dd649cfc7cf997d2844' 
  AND token = 'xgSfMNeuR72LUaLqyOvcIFH+z6plCAtqweEggN2i1iY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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