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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f13b7f81f21db1afbf6250f441c4a5dba561c7d6d1ee4472c07d57010a0ed4d9' 
  AND token = '8VEsU9e3u5au/1ELci4ATZzpV9N3ytg1hj7U42G8CF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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