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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8da40761a1c8739b2359dbd61e94ad2b74fb79ab1e5eb079db7b537464c5ebc8' 
  AND token = 'mBXMem3q344LQwgvu28y4da+BoeT43O5idllvi4IHHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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