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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1587b404038adcafb16ef99dff47e6ac302b5b29d5583ebd8dea9f2fc1229af9' 
  AND token = 'CTsXnirjjjmnlAncrb1fbVeTji9dppaA5Br4lws1njU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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