Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c114240e3aeaddd726a06ce0f54aa2e8b3c75ee8cec731c7843216705f15f1ec' 
  AND token = 'QhmWCo4/81l9/8cMpR2sKBbjJ4K9D6Wij1xTtaRO5Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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