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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '09fdb894d34405f0d9a7248157d9c40efa8edd606652e42cf40761e446655c3c' 
  AND token = 'E69SPr3ylTqHg0pyha/6XGyCBuWyIKP0Ol/cMnmj8zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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