Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd4b12d0d9764dd1038f3c80d4ae80dc8b2fcb5df1aec5fed95c38274df41f3f1' 
  AND token = 'bxErjRxPi1B8K+tLe8yuQukRKUzIy/qbyWntpigvBhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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