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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e93fc4547f8a423256dae7e4d07026ce58356789f10db462afad5cbaa65175ec' 
  AND token = 'wM+mE5T5wSHfwg1dEc1ojMeK5Dvf3poPyCTjINLPC74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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