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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '297356974cde072416bc7c3a4f9d65bf27974051560174f9e1ea9d9d94e92315' 
  AND token = 'yuyDnKFQ7zPq7RIoqkr66teRdiDvu/ieFtZ+37FaCNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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