SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eecab7f33e1fa812e9cd6c57a0504a024fc04f58dc91f8410b7c19e84d22d88c' 
  AND token = 'SyD3HBAfGUAizPDsTe/EKg/Q0prxS6CK2/thquxUEGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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