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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cf1eb57b917fa8ce398ffaf231fa3c62eb05f2c43a34c7a14bedf4a10f40b437' 
  AND token = 'BNAK3odtoQcG2rqLKzZpiP4clCRSC9E4y/Mf0sHvjKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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