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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '16159cc0f02767e477717129b04f7ded2940b833bcd3bca3914b8fd0059a434e' 
  AND token = 'St4aEsouSz90qh+CXl4FlqeOsXAwvYgtb9crNr2RsYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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