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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8fdb5df3b04d8604bade0566455e0466f72c1cf1b6c8bc1e7fc5a51e4cd782c7' 
  AND token = 'nen5r4Z0477Xbak0r5PV95bkfchgmhu8/VrD3bWZ4jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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