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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'da15221b2bfa5dce6b7cc20ca74e3b79fde68c56fe9a5acf884df4724a3b4ec6' 
  AND token = '96YqQp+6Uc6UI7E5GQagRaMmRBzfDwVfmcdDHZ0KVsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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