Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e39b292d1d0b1022d97103072f4905555d628ec0b866db9891710f7d97f3c99b' 
  AND token = 'sXAbjy4VfGdSYioUvtg5vby4pw8ZEdr5oMASegcfZRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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