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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3f5c49d3eb30af98fafac142113cebd2693cc2ba6b093dfec63223f507e90319' 
  AND token = 'OPREo5xYKFabXk8aPyVp3M+s2Hh4C+tIfY2fdllR3pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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