Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f58644cd5516a7b1ebc2a8e997b841ab50b45744c0a7029efcc15486e32b0cb' 
  AND token = 'rzcjP6jFgN7PElUrMdZtqCqaZjQdzaC1vfAnRRNwS1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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