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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '53f8ed148ea3b606f6e9a4271a66ee11c879373a696c86c1c6abc95655ad5911' 
  AND token = 'VSX2xu27kCWWmQ5tzMvu8TUbWyCw0ND1gkckSmdwBEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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