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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '171e264b6494b9cb88e971f73959a29c6587f651e761d1871a7b701083c3852a' 
  AND token = '19AkJtNSoL8zxQOecv3W5uqUi2m4RPA/tdN5sOi/d4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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