Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e43d1918900edeb7fef490d7bc5934d343750339bcde69cc125ae9277e054e8' 
  AND token = 'tILFmpJucuJvHdzJrtVWH1eLkbg6nxGogkFNF/GW8X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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