Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3243693ec02737ffd003c4ea0ae621271f158e7897eea46895379c99a97b52f' 
  AND token = 'L5UcmT5TzeHH4qZuBkmzSC/hbWTReIL1P16dxkOqmAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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