Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5316c18fd399434e1446cd031d24b88375854989361bf185050b8cc0a9c1b3b' 
  AND token = '6qtzzQjsXFDzturZvLec/1FlJzWqayFtcqzVJOQgkTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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