SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b7c1c1b0fde250879880b78206dc6162b529359857ae3e0271168749849a0b13' 
  AND token = 'feRy7UduGzXi9bJPmG7wlnXpCOh+IMpLqEU4LbIz+so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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