Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd88f4be520fad10bac352e06885ba9bc1c0fa1f67bb5d9570621219846bbe5be' 
  AND token = 'fW//bRNTArhx04AT4s9G4c/Oixa8Ez5+jVXgUV+RurY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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