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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4db10f50f8fa0ce4c3dbbfd902a7648dc6fff03f9de812c8c726afe5870d6c1e' 
  AND token = 'ScBPo1o5BZk5utAsN4afBTVCE7hHf1C7Qzd1bIVed2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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