Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78faed3b1d0b6d29f1fbfa63626a695e53c311b6cae07bc596f9009baa86f2ea' 
  AND token = 'zx4UurJXyMRleP+RzWhbIuuhLF5wJ6cUkI5Q6HbwPI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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