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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '716494149851144098f9c5fb21a27fa6655880aa64cd6954d6ea229256d10113' 
  AND token = 'abftf7tHHe7A76AtOwxpgrPLHdW+UR43l3Ys9WG8zjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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