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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '84185248a0774f3e78968b761d286d28dcd5f6c468df5081a34781e52adf360a' 
  AND token = 'EiRZAt5ApfitkxVPLBRF3YmodfiDT8bh37ge6g/B9Lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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