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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '7d1c4338f6dee0fc62bb9d6bd10ab5922d2d4a08211687f3f647e0b4ed2d2e27' 
  AND token = 'Wo6H4iZP4isnWvSXCRIZ3xp9z6NycmL3Um2UXlbup2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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