Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f27d6821693368797612786383275a101b16c100ac760d908270bde4460a1af5' 
  AND token = 'ayRtEVwZf9ovFMjobx43sVEWP/4qacmeReYR37j3Lp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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