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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0ede4e15670d559bec9fbc9d74897ee33f48135a04fb3ce747ad845d5334e94d' 
  AND token = 'y09zUIfBtCylvIfab+rHggfUY6lF9mv8HdufcPtdxqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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