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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '625c98cf4d9c8b88a813a690f9d6940e9132708487b760d7544429737112fc45' 
  AND token = 'pYgD356Lgs0lZK3dFnRKy3J2ipAcbgcwI7lmoOcCx9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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