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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ad9a751235dccaa709f1958b2ef38733c73b26ca525f2bbf14791451eb402c5e' 
  AND token = 'LgJee86uIb896ZdIheu7HVFBVNU3M/byBsuGsZlu5ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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