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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2483fc4d18283c0af657ac9739fa2b5fb18cfb767575fc97cdc9c2f08c0bcbf5' 
  AND token = 'yMw9nwzBtrKNts0wVx8EDl7hASurw38fWdD1PzEK2kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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