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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8fcff1596247d9202f738cbdb19d5402b2941f18e868e6a2e081e9604baf7826' 
  AND token = 'RrE5a5zoQ/ywcHGdBE6aTJmQX6Rs6b+MeSpYKRztnRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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