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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6c13da442f4b94ff28f38874f261df014b868d8b78339a020246b66a61513f29' 
  AND token = 'Cq1pzj1fmtRyME5iFVj+u23rV20CH0PSGcShE7aI3NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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