Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3e0226fe542ad81778a8985a063ca4b3b33365c55c6923c653045712d52ca37' 
  AND token = 'N7R1FRhco53Jff3jFIt3mJwDwAQb5s7SNRbEhdSO25c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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