Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78b36992b45c92236c650029969a46331b8502bbda2b2746ef18d6259242bc78' 
  AND token = 'QJd5QTzLxlYgKvGM3Wv4MRbL8MdSX2Kcxp1fInMcV7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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