SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0192359190d00d7a06f6a2c13fa322fe1f57946abb72035dd9be6b83c72c59a2' 
  AND token = 'rZxQ/rP3wjDSeUlW2lKvVjfe7rGTlNBNisuttwOngBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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