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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ca3977d24781483382f076493f5d602c96487686dd31d5c96b4a3646469e94e0' 
  AND token = 'UKxrUYE8JSe2gX7NyvmOqyabl0dxP7L1CGOmHqR2db0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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