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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5f64643ff973d8bd807a12012181e9becbd9269d1cb03aef4116143db964a397' 
  AND token = 'NZka1UTp0CtaywQ7Seoo7/vRM++GIkN4inf7DZ8ecCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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