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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6e9dea711cca94e3e57f527d2dc3a4cb4ab5cca54b6aaba78c0bfc1bc895ab46' 
  AND token = '6eDISVRRcuJ8NxMS+PmiWdkMNQfE6hR448pdr0f2ibA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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