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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '08e375926a10ac032633ec0f10ad3d37134cb571cb489d34950767634237230d' 
  AND token = 'UAa3llemsjWAHVVi8iwq4T0y3rUOuzGnuBMsi10pELE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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