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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '43eace30c1f80cc964fb136c39c36d1800e49b272bada1592b9f9054a1ad19a7' 
  AND token = '7VzKPwSWDzdpQbkuFEGNLoIeqnzeBSkfrn5VONdKJv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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