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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b498eb68b3ece143ddb4e0ae1e210b145ccff13a663fb8796d75fabd8ddf6c84' 
  AND token = 'kiJMmf2CZf3gkaVJKeleHZkzzSTtjPI23a8nJ6caA/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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