Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03442e23bf38052bc54136978b510e76a63a77062d1239b75a5a4f4ac7cc5aa5' 
  AND token = 'JL3RU7XcnLgqmyAwuUKKY5iBAdfHseMgAwUodtQ+XSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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