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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '449a798b3a4c34638760b7ad2ef67fd08c436dd4bc66bd2b1eeb68b31168ccba' 
  AND token = 'jX1futJJsSzis3nZ9TtO+GODD9QIDW4sUC+PO2gjRcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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