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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'bfa1e53f452c0959ca0bf7d9589623434cca24b68cb11fb22e43355ca44e4c0f' 
  AND token = 'MBHNFE3Y198fq+1kxU/ahwVG0sGqQF09eTVvmqi0+TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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