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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '01e423069fcd9f51bfda4cc3a9bb521854429db601d5efb3a973f844cef4a3cf' 
  AND token = 'Qpgt4Xj1AK8TVdr++fsQFT9nITuanziZ1ZoM5w5MGsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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