Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f5e8d83a5c36386744104f9e19879a8a7666db2ddfc38ec4ed2fedb38cf528' 
  AND token = '+W2OrFSqG3OOCiZvOmS/99K4CofMcV3F3eCGGL9MMFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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