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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6267856c49a752e2b3daf3efd59330344d5ddf19a2eb04819879d805b7bac573' 
  AND token = 'S/F5byPw5y8qnMaNsC56kjRBACM4G1k4Xm5Y//XJUe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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