Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a1fe103678e686690e900a8cd93f6f230b05da378dbaf1cd17c20e98508cc0' 
  AND token = 'phoF8cqSfNQzxOYbcCyFwBXWYCaeXcY73z1pLPSopsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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