Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6352ef9b827f1b928924fbf5ba3136846621388afbf53bfde08296ac07f9a6c' 
  AND token = 'ePNaKA8qJ2J+h0bGnmYWP7PMEbsSedVnO2AMqT16+hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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