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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fc6edba06794eb3c6261c0c937d40789d392f2f9ddfafda56f4885fe23b9ea23' 
  AND token = '+YeVJvMrqxtJtU9ow4mhHz7PWVLf0Ua9Y4N8ExUJImc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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