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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5ddfc4066233ad43a6018ad1ed1707a548affc86d64f4248861b22a6095a2f1e' 
  AND token = 'UtpAJG0cr961/q4PCQQSR2tMhqSw4rF9jAt6nP5aMJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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