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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '08f2f46a57060f934419d89d226ed88acbf189d3bb5e21d89f365df29af8d68b' 
  AND token = 'NS1PzYXIGGZlRuiGwjmSeduhXxxd8TAHE2Uaz5IS/yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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