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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e9daf8f862152fc15c6a3e3749370d6974fdf541097bc7a61e69b5a3ce2212c6' 
  AND token = 'O7+8QCJj1vcw6jLew04CrfvaEgLw68TgKCU6DUXE2fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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