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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '79dfb0e1ad36b8ddcdd53aeeee3b6302cd591da2037d0b3e3b49efd0a8ef8a1b' 
  AND token = 'VXsAJ/KJ2Xm+LhgP2LDG5tk92Z9Ay7ZnhMsx7WiqyJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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