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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '54c7d79c94664fa6a4ed0f9ad8e1319761abdd4e71db29456243c83ee4ff2a3c' 
  AND token = 'hd39yJP1IooLj0vovbIk0sqSG/Idr1+OBuVsL/xJAI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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