SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '05fd9b82cdc54867455b7843c4d2205bd3f23721f5b1632a2e7d9fb251dc52d5' 
  AND token = 'hfT++WyLS0GbukPjYOgjkHxX4XknIqG8o1OBAGABl1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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