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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fd91c7a2a84b92ef43738cf05dacfad41aaa64542b0c5b88dda26e2ceb5229cf' 
  AND token = 'tdmr0hKhYQZycPq07zSACZ/vi5yoCFCbyzxqtdko9xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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