SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2d4f2c7f407769585d71a3cf56204cdd194fb197bee418d52be061bc2581d50f' 
  AND token = '96ViLk9PhqcJWQfUbQf7g2Z8L6ISjK351YxW4F0Fuwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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