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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '18ef8d27ec6138f04caae7cc400e557b3fc10b61a03dd58be342131cec88b65e' 
  AND token = 'DINu26+ALeLCBGoejTLMHEnwUjlF3E03PdL5zwegeyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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